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1210 Commits

Author SHA1 Message Date
Dan Gohman
f9b0419cd8 Don't do (x - (y - z)) --> (x + (z - y)) on floating-point types, because 
it may round differently. This fixes PR4374.

llvm-svn: 73243
 2009-06-12 19:23:25 +00:00
Chris Lattner
e0360f8ae8 Fix 4366: store to null in non-default addr space should not be 
turned into unreachable.

llvm-svn: 73195
 2009-06-11 17:54:56 +00:00
Eli Friedman
770f633389 PR4340: Run SimplifyDemandedVectorElts on insertelement instructions; 
sometimes it can find simplifications that won't be found otherwise.

llvm-svn: 73006
 2009-06-06 20:08:03 +00:00
Dan Gohman
5f6f8101d5 Split the Add, Sub, and Mul instruction opcodes into separate 
integer and floating-point opcodes, introducing
FAdd, FSub, and FMul.

For now, the AsmParser, BitcodeReader, and IRBuilder all preserve
backwards compatability, and the Core LLVM APIs preserve backwards
compatibility for IR producers. Most front-ends won't need to change
immediately.

This implements the first step of the plan outlined here:
http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt

llvm-svn: 72897
 2009-06-04 22:49:04 +00:00
Dan Gohman
882851fe9f Don't do the X * 0.0 -> 0.0 transformation in instcombine, because 
instcombine doesn't know when it's safe. To partially compensate
for this, introduce new code to do this transformation in
dagcombine, which can use UnsafeFPMath.

llvm-svn: 72872
 2009-06-04 17:12:12 +00:00
Evan Cheng
77529302a6 Fix bug in FoldFCmp_IntToFP_Cst. If inttofp is a uintofp, use unsigned instead of signed integer constant. 
llvm-svn: 72300
 2009-05-22 23:10:53 +00:00
Dan Gohman
fc28858d91 Teach ValueTracking a new way to analyze PHI nodes, and and teach 
Instcombine to be more aggressive about using SimplifyDemandedBits
on shift nodes. This allows a shift to be simplified to zero in the
included test case.

llvm-svn: 72204
 2009-05-21 02:28:33 +00:00
Chris Lattner
eb2f327449 calls in nothrow functions can be marked nothrow even if the callee 
is not known to be nothrow.  This allows readnone/readonly functions
to be deleted even if we don't know whether the callee can throw.

llvm-svn: 71676
 2009-05-13 17:39:14 +00:00
Duncan Sands
f7af13b2d4 Rename PaddedSize to AllocSize, in the hope that this 
will make it more obvious what it represents, and stop
it being confused with the StoreSize.

llvm-svn: 71349
 2009-05-09 07:06:46 +00:00
Nick Lewycky
8d9ef77adc This transform requires valid TargetData info. Wrap it in 'if (TD)' in 
preparation for the day we use null TargetData when no target is specified.

llvm-svn: 71210
 2009-05-08 06:47:37 +00:00
Dan Gohman
679947f6ea Perform constant folding on operands of instructions with non-void 
types, such as loads and calls.

llvm-svn: 71175
 2009-05-07 19:43:39 +00:00
Duncan Sands
880eaf5278 Allow readonly functions to unwind exceptions. Teach 
the optimizers about this.  For example, a readonly
function with no uses cannot be removed unless it is
also marked nounwind.

llvm-svn: 71071
 2009-05-06 06:49:50 +00:00
Dan Gohman
d13f1a3b59 Return null instead of false, as appropriate. 
llvm-svn: 70054
 2009-04-25 17:28:45 +00:00
Dan Gohman
a7fae1f865 Add several more icmp simplifications. Transform signed comparisons 
into unsigned ones when the operands are known to have the same
sign bit value.

llvm-svn: 70053
 2009-04-25 17:12:48 +00:00
Sanjiv Gupta
f1177e1be7 Allow i16 type indices to gep. 
llvm-svn: 69946
 2009-04-24 02:37:54 +00:00
Sanjiv Gupta
0cb9d67bcc Before trying to introduce/eliminate cast/ext/trunc to make indices type as 
pointer type, make sure that the pointer size is a valid sequential index type.

llvm-svn: 69574
 2009-04-20 06:05:54 +00:00
Chris Lattner
7d75f78b92 Instcombine should not promote whole computation trees to "strange" 
integer types, unless they are already strange.  This prevents it from
turning the code produced by SROA into crazy libcalls and stuff that 
the code generator can't handle.  In the attached example, the result
was an i96 multiply that caused the x86 backend to assert.

Note that if TargetData had an idea of what the legal types are for
a target that this could be used to stop instcombine from introducing
i64 muls, as Scott wanted.

llvm-svn: 68598
 2009-04-08 05:41:03 +00:00
Chris Lattner
2f520929d4 fix rdar://6762290, a crash compiling cxx filt with clang. 
llvm-svn: 68500
 2009-04-07 05:03:34 +00:00
Evan Cheng
c419350132 Throttle back "fold select into operand" transformation. InstCombine should not generate selects of two constants unless they are selects of 0 and 1. 
e.g.
define i32 @t1(i32 %c, i32 %x) nounwind {
       %t1 = icmp eq i32 %c, 0
       %t2 = lshr i32 %x, 18
       %t3 = select i1 %t1, i32 %t2, i32 %x
       ret i32 %t3
}

was turned into

define i32 @t2(i32 %c, i32 %x) nounwind {
       %t1 = icmp eq i32 %c, 0
       %t2 = select i1 %t1, i32 18, i32 0
       %t3 = lshr i32 %x, %t2
       ret i32 %t3
}

For most targets, that means materializing two constants and then a select. e.g. On x86-64

movl    %esi, %eax
shrl    $18, %eax
testl   %edi, %edi
cmovne  %esi, %eax
ret

=>

xorl    %eax, %eax
testl   %edi, %edi
movl    $18, %ecx
cmovne  %eax, %ecx
movl    %esi, %eax
shrl    %cl, %eax
ret

Also, the optimizer and codegen can reason about shl / and / add, etc. by a constant. This optimization will hinder optimizations using ComputeMaskedBits.

llvm-svn: 68142
 2009-03-31 20:42:45 +00:00
Chris Lattner
c055403764 Fix PR3874 by restoring a condition I removed, but making it more 
precise than it used to be.

llvm-svn: 67662
 2009-03-25 00:28:58 +00:00
Chris Lattner
be6ee56fb2 oops, I intended to remove this, not comment it out. Thanks Duncan! 
llvm-svn: 67657
 2009-03-24 23:48:25 +00:00
Chris Lattner
aabd3eeeff canonicalize inttoptr and ptrtoint instructions which cast pointers 
to/from integer types that are not intptr_t to convert to intptr_t
then do an integer conversion to the dest type.  This exposes the
cast to the optimizer.

llvm-svn: 67638
 2009-03-24 18:35:40 +00:00
Chris Lattner
51a4134e1c two changes: 
1. Make instcombine always canonicalize trunc x to i1 into an icmp(x&1).  This 
   exposes the AND to other instcombine xforms and is more of what the code
   generator expects.
2. Rewrite the remaining trunc pattern match to use 'match', which 
   simplifies it a lot.
   

llvm-svn: 67635
 2009-03-24 18:15:30 +00:00
Duncan Sands
3c115770e7 Factorize out a concept - no functionality change. 
llvm-svn: 67454
 2009-03-21 21:27:31 +00:00
Chris Lattner
623662e8e1 Fix instcombine to not introduce undefined shifts when merging two 
shifts together.  This fixes PR3851.

llvm-svn: 67411
 2009-03-20 22:41:15 +00:00
Duncan Sands
926d062a48 Don't load values out of global constants with weak 
linkage: the value may be replaced with something
different at link time.  (Frontends that want to
allow values to be loaded out of weak constants can
give their constants weak_odr linkage).

llvm-svn: 67407
 2009-03-20 21:53:29 +00:00
Chris Lattner
0542f9f1ba Fix PR3826 - InstComb assert with vector shift, by not calling ComputeNumSignBits on a vector. 
llvm-svn: 67211
 2009-03-18 16:32:19 +00:00
Chris Lattner
43ae27a75e Remove a condition which is always true. 
llvm-svn: 67089
 2009-03-17 17:55:15 +00:00
Dale Johannesen
a4bb3e6d14 One more place where debug info affects codegen. 
llvm-svn: 66930
 2009-03-13 19:23:20 +00:00
Bill Wendling
5499163a0a Oops...I committed too much. 
llvm-svn: 66867
 2009-03-13 04:39:26 +00:00
Bill Wendling
02a239b837 Temporarily XFAIL this test. 
llvm-svn: 66866
 2009-03-13 04:37:11 +00:00
Dale Johannesen
bc9067e872 Skip interleaved debug info when fast-forwarding through 
allocations.  Apparently the assumption is there is an
instruction (terminator?) following the allocation so I
am allowing the same assumption.

llvm-svn: 66716
 2009-03-11 22:19:43 +00:00
Dale Johannesen
f650b9b7da Removing a dead debug intrinsic shouldn't trigger 
another instcombine pass if we weren't going to make
one without debug info.

llvm-svn: 66576
 2009-03-10 21:19:49 +00:00
Chris Lattner
e367477979 change the MemIntrinsic get/setAlignment method to take an unsigned 
instead of a Constant*, which is what the clients of it really want.

llvm-svn: 66364
 2009-03-08 03:59:00 +00:00
Chris Lattner
f827ae4fa5 Introduce a new MemTransferInst pseudo class, which is a common 
parent between MemCpyInst and MemMoveInst, simplify some code to
use it.

llvm-svn: 66361
 2009-03-08 03:37:16 +00:00
Dale Johannesen
a73a4ee680 Fix another case where debug info was affecting 
codegen.  I convinced myself it was OK to skip all
pointer bitcasts here too.

llvm-svn: 66122
 2009-03-05 02:06:48 +00:00
Dale Johannesen
428972ecad Fix another case where a dbg.declare meant something 
had 2 uses instead of 1.

llvm-svn: 66112
 2009-03-05 00:39:02 +00:00
Dale Johannesen
e184480072 Always skip ptr-to-ptr bitcasts when counting, 
per Chris' suggestion.  Slightly faster.

llvm-svn: 65999
 2009-03-04 01:53:05 +00:00
Dale Johannesen
a6f7a45366 Make my earlier patch to skip debug intrinsics 
when counting work; it was only off by 1.

llvm-svn: 65993
 2009-03-04 01:20:34 +00:00
Dale Johannesen
81b6cd8ce5 Instruction counters must skip the bitcasts that 
feed into llvm.dbg.declare nodes, as well as
the debug directives themselves.

llvm-svn: 65976
 2009-03-03 22:36:47 +00:00
Dale Johannesen
ceed180d4c When removing a store to an alloca that has only one 
use, check also for the case where it has two uses,
the other being a llvm.dbg.declare.  This is needed so
debug info doesn't affect codegen.

llvm-svn: 65970
 2009-03-03 21:26:39 +00:00
Dan Gohman
51d4e8db6a Fix a bunch of Doxygen syntax issues. Escape special characters, 
and put @file directives on their own comment line.

llvm-svn: 65920
 2009-03-03 02:55:14 +00:00
Dale Johannesen
d4a205b300 Don't count DebugInfo instructions in another limit 
(lest they affect codegen).

llvm-svn: 65915
 2009-03-03 01:43:03 +00:00
Dale Johannesen
33fa9dc8a9 When sinking an insn in InstCombine bring its debug 
info with it.
Don't count debug info insns against the scan maximum
in FindAvailableLoadedValue (lest they affect codegen).

llvm-svn: 65910
 2009-03-03 01:09:07 +00:00
Duncan Sands
51ce06c788 Fix PR3694: add an instcombine micro-optimization that helps 
clean up when using variable length arrays in llvm-gcc.

llvm-svn: 65832
 2009-03-02 09:18:21 +00:00
Nick Lewycky
44b8675102 Silence compiler warning about use of uninitialized variables (in reality these 
are always set by reference on the path that uses them.) No functional change.

llvm-svn: 65621
 2009-02-27 06:37:39 +00:00
Chris Lattner
1443cb8f77 Fix PR3667 
llvm-svn: 65464
 2009-02-25 18:20:01 +00:00
Dan Gohman
1197d46ccf Fix a ValueTracking rule: RHS means operand 1, not 0. Add a simple 
ashr instcombine to help expose this code. And apply the fix to
SelectionDAG's copy of this code too.

llvm-svn: 65364
 2009-02-24 02:00:40 +00:00
Zhou Sheng
d3008c8b1c Should reset DBI_Prev if DBI_Next == 0. 
llvm-svn: 65314
 2009-02-23 10:14:11 +00:00
Chris Lattner
29437eb4c3 fix some typos that Duncan noticed 
llvm-svn: 65306
 2009-02-23 05:56:17 +00:00